Abstract
We show that some striking properties of the circular motion of charged, ultrarelativistic particles close to the circular photon orbit around a charged black hole (found by Balek, Bičák and Stuchlík) can be easily understood in terms of the centrifugal force vanishing at the circular photon orbit. We also comment briefly on a possible non-uniqueness of the recently-proposed operational definition of the centrifugal force in static spacetimes.
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Balek, V., Bičák, J., and Stuchlík, Z. (1989).Bull. Astron. Inst. Czechosl.,40 133.
Abramowicz, M. A. (1990).Mon. Not. R. Astr. Soc.,245 733.
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Abramowicz, M.A., Bičák, J. The interplay between relativistic gravitational, centrifugal and electric forces: a simple example. Gen Relat Gravit 23, 941–946 (1991). https://doi.org/10.1007/BF00756913
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DOI: https://doi.org/10.1007/BF00756913